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MN 84,
Madhurā: (name of place)
“What do you think, great king?
If this is so, are the four castes equal or not?
Or how do you see this?”
“Certainly, Master Kaccāna, in this case these four castes are equal.
I can’t see any difference between them.”
“And here’s another way to understand that the claims of the brahmins are just propaganda.